Antivirus is a computer software program that helps to identify, neutralize, and eliminate malicious software or programs. It a virus scanner or a virus scanning software which examines all files in specified locations, contents of memory, operating system, registry, unexpected program behavior, and anywhere else relevant with the intention of identifying and removing any malware. We can make the virus dictionary approach only when the antivirus software looks at a files, it refers to a dictionary of known viruses that the authors of the antivirus software have identified. If a piece of code in the file matches any virus identified in the dictionary, then the antivirus software can take one action. It attempts to repair the file by removing the virus itself from the file, in such a way that the file remains inaccessible to other programs and its virus can no longer spread, or even delete the infected one. The virus dictionary approach requires frequent (generally online) downloads of updated virus dictionary entries for the consistent success. People those who want help find viruses not detected by the software can send their infected files to the authors of antivirus software and then identify it by the identification of features and removal of information from its dictionary. Some of the antivirus software mostly based on dictionary examines file when the computer’s operating system creates, opens, closes, or e-mails them. In this way a known virus is immediately detected upon receipt. An emerging technique to deal with mal ware in general is whitelisting. This technique prevents execution of all computer code except few identified and trustworthy system administrator. System administrators can schedule antivirus software to scan all files on the computer’s hard disk on a regular basis. Modern enterprise organizations have large quantities of trusted applications.

The suspicious behavior approach doesn’t attempt to identify known viruses but monitors the behavior of all programs and provides protection against brand new viruses that do not exist in any virus dictionaries. However, it can also sound a large number of false positives, and users probably become desensitized to all the warning. Therefore, most modern antivirus software uses this technique less and less. In this way there is more and different kinds of antivirus produced and used.

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